Bicycle attachment

Abstract

A bicycle attachment is a bench style seating device capable of being secured upon two bicycles. The seat of the bench covers the seat post of each bicycle. A pair of underside cages secure over each rear tire of each bicycle. The attachment has a steering linkage which has a pair of clamps, a pair of alignment rods, and a connecting rod. The bench has a seat assembly which in turn has a seat base and a back rest, a seat base support.

The invention claimed is: 
     
       1. A four-wheel bicycle conversion kit for connecting a pair of two-wheel bicycles, comprising:
 a steering linkage, wherein the steering linkage comprises:
 a pair of clamps, each clamp being configured for removably attaching to a respective handlebar of the two-wheel bicycles; 
 a pair of alignment rods, each alignment rod being secured to a corresponding clamp; and, 
 a connecting rod pivotally coupled to the pair of alignment rods to provide synchronized steering motion of the handlebars; 
 
 a seat assembly, wherein the seat assembly comprises:
 a seat base; 
 a back rest; and, 
 a pair of vertical supports, each vertical support being configured to support the back rest and to extend toward a seat base support; 
 
 the seat base support, wherein the seat base support comprises:
 a six-sided frame including four forward upright structural members, four aft upright structural members, a bottom structural member, a top structural member, and a pair of seat connection supports each terminating in a seat connection configured for attachment to a respective seat post of the two-wheel bicycles; 
 
 a pair of box frame assemblies, each box frame assembly comprising:
 an inner pair of the forward upright structural members; 
 an inner pair of the aft upright structural members; 
 a portion of the bottom structural member; and, 
 a portion of the top structural member; 
 
 a carrier basket disposed between the pair of box frame assemblies, wherein the carrier basket comprises:
 a basket rear wall; 
 a basket front wall; 
 a pair of basket side walls, at least one basket side wall being formed of a mesh material; and, 
 a basket bottom wall; and, 
 
 a mounting system, wherein the mounting system comprises:
 a plurality of mounting brackets, each mounting bracket comprising a bracket planar portion having an aperture sized for attachment to an extended portion of a respective rear axle of the two-wheel bicycles and a bracket tubular portion having a threaded receiver, the threaded receiver being configured to engage a respective upright threaded portion of the forward upright structural members. 
 
 
     
     
       2. The four-wheel bicycle conversion kit of  claim 1 , wherein:
 the forward upright structural members of the seat base support each comprises an upright tubular portion and the upright threaded portion located at a lower end of the upright tubular portion; 
 each mounting bracket comprises the bracket planar portion with the aperture configured to receive the extended portion of the rear axle and the bracket tubular portion with the threaded receiver configured for removably fastening to the upright threaded portion of the forward upright structural member; 
 the connecting rod is connected to the pair of alignment rods via a respective pivot point; and, 
 the kit is constructed of materials selected from the group consisting of steel, aluminum, and combinations thereof.